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Disordered drinking in developing spontaneously hypertensive rats.

F S Kraly, L A Coogan, S M Specht

    The American Journal of Physiology
    |April 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

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    Spontaneously hypertensive rats (SHR) drink more and interrupt eating to drink, but this hyperdipsia isn't essential for hypertension development. Restricted water intake slows SHR growth and hypertension, similar to food restriction.

    Area of Science:

    • Physiology
    • Animal Models
    • Hypertension Research

    Background:

    • Spontaneously hypertensive rats (SHR) exhibit altered feeding and drinking behaviors.
    • Understanding these behaviors is crucial for elucidating hypertension development mechanisms.

    Purpose of the Study:

    • To investigate the role of hyperdipsia (excessive thirst) and eating patterns in the development of hypertension in SHR.
    • To determine if salivary function is a primary cause of hyperdipsia in SHR.

    Main Methods:

    • Comparative analysis of water intake, food spillage, and eating patterns in SHR and Wistar-Kyoto (WKY) rats from 5-17 weeks of age.
    • Assessment of salivation response to pilocarpine nitrate in adult SHR and WKY rats.
    • Experimental manipulation of water and food access to observe effects on growth and hypertension development.

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    Main Results:

    • SHR exhibited significantly higher water intake and food spillage than WKY rats, with an inverse relationship between the two.
    • SHR interrupted eating to drink, a pattern absent with liquid food and reduced by water infusion.
    • Reduced water access in SHR slowed both body weight gain and hypertension development, comparable to food restriction effects.

    Conclusions:

    • Hyperdipsia in SHR, potentially linked to deficient salivary function, is not a prerequisite for hypertension development.
    • Restricted water intake retards hypertension development in SHR primarily through delayed growth.
    • Altered eating and drinking behaviors in SHR are complex and influenced by multiple factors beyond simple thirst.